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annotate src/share/vm/gc_implementation/g1/g1MarkSweep.cpp @ 1552:c18cbe5936b8
6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair
| author | trims |
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| date | Thu, 27 May 2010 19:08:38 -0700 |
| parents | 0bfd3fb24150 |
| children | 894b1d7c7e01 |
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| 342 | 1 /* |
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2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_g1MarkSweep.cpp.incl" | |
| 27 | |
| 28 class HeapRegion; | |
| 29 | |
| 30 void G1MarkSweep::invoke_at_safepoint(ReferenceProcessor* rp, | |
| 31 bool clear_all_softrefs) { | |
| 32 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint"); | |
| 33 | |
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34 SharedHeap* sh = SharedHeap::heap(); |
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35 #ifdef ASSERT |
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36 if (sh->collector_policy()->should_clear_all_soft_refs()) { |
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37 assert(clear_all_softrefs, "Policy should have been checked earler"); |
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38 } |
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39 #endif |
| 342 | 40 // hook up weak ref data so it can be used during Mark-Sweep |
| 41 assert(GenMarkSweep::ref_processor() == NULL, "no stomping"); | |
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42 assert(rp != NULL, "should be non-NULL"); |
| 342 | 43 GenMarkSweep::_ref_processor = rp; |
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44 rp->setup_policy(clear_all_softrefs); |
| 342 | 45 |
| 46 // When collecting the permanent generation methodOops may be moving, | |
| 47 // so we either have to flush all bcp data or convert it into bci. | |
| 48 CodeCache::gc_prologue(); | |
| 49 Threads::gc_prologue(); | |
| 50 | |
| 51 // Increment the invocation count for the permanent generation, since it is | |
| 52 // implicitly collected whenever we do a full mark sweep collection. | |
| 53 sh->perm_gen()->stat_record()->invocations++; | |
| 54 | |
| 55 bool marked_for_unloading = false; | |
| 56 | |
| 57 allocate_stacks(); | |
| 58 | |
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59 // We should save the marks of the currently locked biased monitors. |
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60 // The marking doesn't preserve the marks of biased objects. |
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61 BiasedLocking::preserve_marks(); |
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62 |
| 342 | 63 mark_sweep_phase1(marked_for_unloading, clear_all_softrefs); |
| 64 | |
| 751 | 65 if (VerifyDuringGC) { |
| 342 | 66 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
| 67 g1h->checkConcurrentMark(); | |
| 68 } | |
| 69 | |
| 70 mark_sweep_phase2(); | |
| 71 | |
| 72 // Don't add any more derived pointers during phase3 | |
| 73 COMPILER2_PRESENT(DerivedPointerTable::set_active(false)); | |
| 74 | |
| 75 mark_sweep_phase3(); | |
| 76 | |
| 77 mark_sweep_phase4(); | |
| 78 | |
| 79 GenMarkSweep::restore_marks(); | |
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80 BiasedLocking::restore_marks(); |
| 342 | 81 GenMarkSweep::deallocate_stacks(); |
| 82 | |
| 83 // We must invalidate the perm-gen rs, so that it gets rebuilt. | |
| 84 GenRemSet* rs = sh->rem_set(); | |
| 85 rs->invalidate(sh->perm_gen()->used_region(), true /*whole_heap*/); | |
| 86 | |
| 87 // "free at last gc" is calculated from these. | |
| 88 // CHF: cheating for now!!! | |
| 89 // Universe::set_heap_capacity_at_last_gc(Universe::heap()->capacity()); | |
| 90 // Universe::set_heap_used_at_last_gc(Universe::heap()->used()); | |
| 91 | |
| 92 Threads::gc_epilogue(); | |
| 93 CodeCache::gc_epilogue(); | |
| 94 | |
| 95 // refs processing: clean slate | |
| 96 GenMarkSweep::_ref_processor = NULL; | |
| 97 } | |
| 98 | |
| 99 | |
| 100 void G1MarkSweep::allocate_stacks() { | |
| 101 GenMarkSweep::_preserved_count_max = 0; | |
| 102 GenMarkSweep::_preserved_marks = NULL; | |
| 103 GenMarkSweep::_preserved_count = 0; | |
| 104 GenMarkSweep::_preserved_mark_stack = NULL; | |
| 105 GenMarkSweep::_preserved_oop_stack = NULL; | |
| 106 | |
| 107 GenMarkSweep::_marking_stack = | |
| 108 new (ResourceObj::C_HEAP) GrowableArray<oop>(4000, true); | |
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109 GenMarkSweep::_objarray_stack = |
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110 new (ResourceObj::C_HEAP) GrowableArray<ObjArrayTask>(50, true); |
| 342 | 111 |
| 941 | 112 int size = SystemDictionary::number_of_classes() * 2; |
| 342 | 113 GenMarkSweep::_revisit_klass_stack = |
| 941 | 114 new (ResourceObj::C_HEAP) GrowableArray<Klass*>(size, true); |
| 115 // (#klass/k)^2 for k ~ 10 appears a better fit, but this will have to do | |
| 116 // for now until we have a chance to work out a more optimal setting. | |
| 117 GenMarkSweep::_revisit_mdo_stack = | |
| 118 new (ResourceObj::C_HEAP) GrowableArray<DataLayout*>(size*2, true); | |
| 119 | |
| 342 | 120 } |
| 121 | |
| 122 void G1MarkSweep::mark_sweep_phase1(bool& marked_for_unloading, | |
| 123 bool clear_all_softrefs) { | |
| 124 // Recursively traverse all live objects and mark them | |
| 125 EventMark m("1 mark object"); | |
| 126 TraceTime tm("phase 1", PrintGC && Verbose, true, gclog_or_tty); | |
| 127 GenMarkSweep::trace(" 1"); | |
| 128 | |
| 129 SharedHeap* sh = SharedHeap::heap(); | |
| 130 | |
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131 sh->process_strong_roots(true, // activeate StrongRootsScope |
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132 true, // Collecting permanent generation. |
| 342 | 133 SharedHeap::SO_SystemClasses, |
| 134 &GenMarkSweep::follow_root_closure, | |
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135 &GenMarkSweep::follow_code_root_closure, |
| 342 | 136 &GenMarkSweep::follow_root_closure); |
| 137 | |
| 138 // Process reference objects found during marking | |
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139 ReferenceProcessor* rp = GenMarkSweep::ref_processor(); |
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140 rp->setup_policy(clear_all_softrefs); |
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141 rp->process_discovered_references(&GenMarkSweep::is_alive, |
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142 &GenMarkSweep::keep_alive, |
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143 &GenMarkSweep::follow_stack_closure, |
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144 NULL); |
| 342 | 145 |
| 146 // Follow system dictionary roots and unload classes | |
| 147 bool purged_class = SystemDictionary::do_unloading(&GenMarkSweep::is_alive); | |
| 148 assert(GenMarkSweep::_marking_stack->is_empty(), | |
| 149 "stack should be empty by now"); | |
| 150 | |
| 151 // Follow code cache roots (has to be done after system dictionary, | |
| 152 // assumes all live klasses are marked) | |
| 153 CodeCache::do_unloading(&GenMarkSweep::is_alive, | |
| 154 &GenMarkSweep::keep_alive, | |
| 155 purged_class); | |
| 941 | 156 GenMarkSweep::follow_stack(); |
| 342 | 157 |
| 158 // Update subklass/sibling/implementor links of live klasses | |
| 159 GenMarkSweep::follow_weak_klass_links(); | |
| 160 assert(GenMarkSweep::_marking_stack->is_empty(), | |
| 161 "stack should be empty by now"); | |
| 162 | |
| 941 | 163 // Visit memoized MDO's and clear any unmarked weak refs |
| 164 GenMarkSweep::follow_mdo_weak_refs(); | |
| 165 assert(GenMarkSweep::_marking_stack->is_empty(), "just drained"); | |
| 166 | |
| 167 | |
| 342 | 168 // Visit symbol and interned string tables and delete unmarked oops |
| 169 SymbolTable::unlink(&GenMarkSweep::is_alive); | |
| 170 StringTable::unlink(&GenMarkSweep::is_alive); | |
| 171 | |
| 172 assert(GenMarkSweep::_marking_stack->is_empty(), | |
| 173 "stack should be empty by now"); | |
| 174 } | |
| 175 | |
| 176 class G1PrepareCompactClosure: public HeapRegionClosure { | |
| 177 ModRefBarrierSet* _mrbs; | |
| 178 CompactPoint _cp; | |
| 179 | |
| 180 void free_humongous_region(HeapRegion* hr) { | |
| 181 HeapWord* bot = hr->bottom(); | |
| 182 HeapWord* end = hr->end(); | |
| 183 assert(hr->startsHumongous(), | |
| 184 "Only the start of a humongous region should be freed."); | |
| 185 G1CollectedHeap::heap()->free_region(hr); | |
| 186 hr->prepare_for_compaction(&_cp); | |
| 187 // Also clear the part of the card table that will be unused after | |
| 188 // compaction. | |
| 189 _mrbs->clear(MemRegion(hr->compaction_top(), hr->end())); | |
| 190 } | |
| 191 | |
| 192 public: | |
| 677 | 193 G1PrepareCompactClosure(CompactibleSpace* cs) : |
| 342 | 194 _cp(NULL, cs, cs->initialize_threshold()), |
| 677 | 195 _mrbs(G1CollectedHeap::heap()->mr_bs()) |
| 342 | 196 {} |
| 197 bool doHeapRegion(HeapRegion* hr) { | |
| 198 if (hr->isHumongous()) { | |
| 199 if (hr->startsHumongous()) { | |
| 200 oop obj = oop(hr->bottom()); | |
| 201 if (obj->is_gc_marked()) { | |
| 202 obj->forward_to(obj); | |
| 203 } else { | |
| 204 free_humongous_region(hr); | |
| 205 } | |
| 206 } else { | |
| 207 assert(hr->continuesHumongous(), "Invalid humongous."); | |
| 208 } | |
| 209 } else { | |
| 210 hr->prepare_for_compaction(&_cp); | |
| 211 // Also clear the part of the card table that will be unused after | |
| 212 // compaction. | |
| 213 _mrbs->clear(MemRegion(hr->compaction_top(), hr->end())); | |
| 214 } | |
| 215 return false; | |
| 216 } | |
| 217 }; | |
| 677 | 218 |
| 219 // Finds the first HeapRegion. | |
| 342 | 220 class FindFirstRegionClosure: public HeapRegionClosure { |
| 221 HeapRegion* _a_region; | |
| 222 public: | |
| 677 | 223 FindFirstRegionClosure() : _a_region(NULL) {} |
| 342 | 224 bool doHeapRegion(HeapRegion* r) { |
| 677 | 225 _a_region = r; |
| 226 return true; | |
| 342 | 227 } |
| 228 HeapRegion* result() { return _a_region; } | |
| 229 }; | |
| 230 | |
| 231 void G1MarkSweep::mark_sweep_phase2() { | |
| 232 // Now all live objects are marked, compute the new object addresses. | |
| 233 | |
| 234 // It is imperative that we traverse perm_gen LAST. If dead space is | |
| 235 // allowed a range of dead object may get overwritten by a dead int | |
| 236 // array. If perm_gen is not traversed last a klassOop may get | |
| 237 // overwritten. This is fine since it is dead, but if the class has dead | |
| 238 // instances we have to skip them, and in order to find their size we | |
| 239 // need the klassOop! | |
| 240 // | |
| 241 // It is not required that we traverse spaces in the same order in | |
| 242 // phase2, phase3 and phase4, but the ValidateMarkSweep live oops | |
| 243 // tracking expects us to do so. See comment under phase4. | |
| 244 | |
| 245 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 246 Generation* pg = g1h->perm_gen(); | |
| 247 | |
| 248 EventMark m("2 compute new addresses"); | |
| 249 TraceTime tm("phase 2", PrintGC && Verbose, true, gclog_or_tty); | |
| 250 GenMarkSweep::trace("2"); | |
| 251 | |
| 677 | 252 FindFirstRegionClosure cl; |
| 342 | 253 g1h->heap_region_iterate(&cl); |
| 254 HeapRegion *r = cl.result(); | |
| 255 CompactibleSpace* sp = r; | |
| 256 if (r->isHumongous() && oop(r->bottom())->is_gc_marked()) { | |
| 257 sp = r->next_compaction_space(); | |
| 258 } | |
| 259 | |
| 677 | 260 G1PrepareCompactClosure blk(sp); |
| 342 | 261 g1h->heap_region_iterate(&blk); |
| 262 | |
| 263 CompactPoint perm_cp(pg, NULL, NULL); | |
| 264 pg->prepare_for_compaction(&perm_cp); | |
| 265 } | |
| 266 | |
| 267 class G1AdjustPointersClosure: public HeapRegionClosure { | |
| 268 public: | |
| 269 bool doHeapRegion(HeapRegion* r) { | |
| 270 if (r->isHumongous()) { | |
| 271 if (r->startsHumongous()) { | |
| 272 // We must adjust the pointers on the single H object. | |
| 273 oop obj = oop(r->bottom()); | |
| 274 debug_only(GenMarkSweep::track_interior_pointers(obj)); | |
| 275 // point all the oops to the new location | |
| 276 obj->adjust_pointers(); | |
| 277 debug_only(GenMarkSweep::check_interior_pointers()); | |
| 278 } | |
| 279 } else { | |
| 280 // This really ought to be "as_CompactibleSpace"... | |
| 281 r->adjust_pointers(); | |
| 282 } | |
| 283 return false; | |
| 284 } | |
| 285 }; | |
| 286 | |
| 287 void G1MarkSweep::mark_sweep_phase3() { | |
| 288 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 289 Generation* pg = g1h->perm_gen(); | |
| 290 | |
| 291 // Adjust the pointers to reflect the new locations | |
| 292 EventMark m("3 adjust pointers"); | |
| 293 TraceTime tm("phase 3", PrintGC && Verbose, true, gclog_or_tty); | |
| 294 GenMarkSweep::trace("3"); | |
| 295 | |
| 296 SharedHeap* sh = SharedHeap::heap(); | |
| 297 | |
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298 sh->process_strong_roots(true, // activate StrongRootsScope |
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299 true, // Collecting permanent generation. |
| 342 | 300 SharedHeap::SO_AllClasses, |
| 301 &GenMarkSweep::adjust_root_pointer_closure, | |
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302 NULL, // do not touch code cache here |
| 342 | 303 &GenMarkSweep::adjust_pointer_closure); |
| 304 | |
| 305 g1h->ref_processor()->weak_oops_do(&GenMarkSweep::adjust_root_pointer_closure); | |
| 306 | |
| 307 // Now adjust pointers in remaining weak roots. (All of which should | |
| 308 // have been cleared if they pointed to non-surviving objects.) | |
| 309 g1h->g1_process_weak_roots(&GenMarkSweep::adjust_root_pointer_closure, | |
| 310 &GenMarkSweep::adjust_pointer_closure); | |
| 311 | |
| 312 GenMarkSweep::adjust_marks(); | |
| 313 | |
| 314 G1AdjustPointersClosure blk; | |
| 315 g1h->heap_region_iterate(&blk); | |
| 316 pg->adjust_pointers(); | |
| 317 } | |
| 318 | |
| 319 class G1SpaceCompactClosure: public HeapRegionClosure { | |
| 320 public: | |
| 321 G1SpaceCompactClosure() {} | |
| 322 | |
| 323 bool doHeapRegion(HeapRegion* hr) { | |
| 324 if (hr->isHumongous()) { | |
| 325 if (hr->startsHumongous()) { | |
| 326 oop obj = oop(hr->bottom()); | |
| 327 if (obj->is_gc_marked()) { | |
| 328 obj->init_mark(); | |
| 329 } else { | |
| 330 assert(hr->is_empty(), "Should have been cleared in phase 2."); | |
| 331 } | |
| 332 hr->reset_during_compaction(); | |
| 333 } | |
| 334 } else { | |
| 335 hr->compact(); | |
| 336 } | |
| 337 return false; | |
| 338 } | |
| 339 }; | |
| 340 | |
| 341 void G1MarkSweep::mark_sweep_phase4() { | |
| 342 // All pointers are now adjusted, move objects accordingly | |
| 343 | |
| 344 // It is imperative that we traverse perm_gen first in phase4. All | |
| 345 // classes must be allocated earlier than their instances, and traversing | |
| 346 // perm_gen first makes sure that all klassOops have moved to their new | |
| 347 // location before any instance does a dispatch through it's klass! | |
| 348 | |
| 349 // The ValidateMarkSweep live oops tracking expects us to traverse spaces | |
| 350 // in the same order in phase2, phase3 and phase4. We don't quite do that | |
| 351 // here (perm_gen first rather than last), so we tell the validate code | |
| 352 // to use a higher index (saved from phase2) when verifying perm_gen. | |
| 353 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
| 354 Generation* pg = g1h->perm_gen(); | |
| 355 | |
| 356 EventMark m("4 compact heap"); | |
| 357 TraceTime tm("phase 4", PrintGC && Verbose, true, gclog_or_tty); | |
| 358 GenMarkSweep::trace("4"); | |
| 359 | |
| 360 pg->compact(); | |
| 361 | |
| 362 G1SpaceCompactClosure blk; | |
| 363 g1h->heap_region_iterate(&blk); | |
| 364 | |
| 365 } | |
| 366 | |
| 367 // Local Variables: *** | |
| 368 // c-indentation-style: gnu *** | |
| 369 // End: *** |